System of motor control.



I J. H. SANDIDGE. SYSTEM OF MOTOR CONTROL.

APPLICATION FILED NOV. 22. 1911.

1,054,144, Patented Feb. 25, 1913.

JOHN HOWARD sANnIDoE, OF oHitoaoo, ILLINOIS, ASSIGNOR OFIONE-HALF WINANS, OF CHICAGO, ILLINOIS. v

Mme sTATF e harm 1 OF C l TO 11.x.

SYSTEM OF llIO'IDR CONTROL.

Be it known that I, JOHN HOWARD SAN- nmen, a citizen. of the United States, residing at Chicago, inthe county of Cook and State of Illinois, have invented certain new and useful Improvements in Systems of Motor Control, of which the following is a. specification. 3

My invention relates to a system for the control and reversal of the direction of rotation of D. C. electric motors in generah and particularly the smaller types of motors for which no separate external starting me'ansis required.

()ne of the principal aims of my invention is to produce a system of wiring of the fewest- )ossible connections, which 1106 er i 7 sting with a. polarized relay, will, when the current, isreverscd in the main or lead lines,

cause the motor to rotate in the opposite direction. I

l urtheraims and advantages will appear as the invention is hot-tor understood from the followin descrinion which. taken in connection with the accompanying drawing, illustrates one embodiment thereof.

Referring to the drawings:-Figure 1. illustrates diagramiuatically my, invention as applied to a series wound motor. lllg. 2. illustrates diagralnmatically a modification thereof as applied to shunt-wound motors.

p xOn th e drawings, a generating source 10 is connected tothe main lines ll and 1; through the/ ;throw-over switch 13, which may be of any preferred type, by means of the wires 14- and 15. From the tln'mvover switch li'llhe line'avirc ll leads totho auto matieally controlled throw-over switch ll' and is connected to the terminals (rand u.

The line wire I2 is connected directly to'lhe lieltl. oi. the motor l7, from which the Wire 18 leads to the terminals?) and (1' of the said switch lti. The switch .lli is yn'ovided Iwilh the flexible leaves 1.9, which are altlaiile'ilio be, either in contact with the/terminals (0 1 or' o I To the ends otllie flexible leaves ll) isattaehed an upright member 20 ol any nonwonducting nmleriah polarixwl relayzll is connected behveen lheline ol' lead Patented Feb. 25, 1913.

wires 11 and 12 in parallel therewith by means of the wire 22 and 23. This polarized relay may be of any desired type. Asoft iron bar 2% is pivoted to the upright+25,

and is adapted to be rotated by means of" the magnetic properties of the relay against l'lIGXSPIlIlg 26. To one end of the bar 24 is pivot-ally connected the non-conducting up right 20 at the point 27. 19 are connected by means of the wires 28 and 29 to the armature 30 of the motor.-

To show the direction of the flow of current throughoutthe various parts of the system embodying my invention, when the same is in operation, I have provided the series of arrows c which indicate the direction of flow when the throw-over switch 13 is positioned as shown in Fig. 1, and the series of arrows (l which show the direction of flow when the said switch is thrown over to reverse the direction 'or" the current in the wires 11 and 19.

The currentflowing from the generator 10 passes through the throw-over switch 13 along the line wire ll following the path of the arrow 0 to the terminal a of the automatic throwover switch 16, thr0ugh the lower flexible leaf 19, through the wire 28 to the armature 30, leaving said 'armature by means of the wire 29, it passes to the up- The flexible leaves through .the tln'ow-over switch 13 and wire:

15 back to the generator [0. With thecur rent flowing as just indicated. the polarized.

relay is inoperative due to its polarized properties, and the sprln 26 holds th e lea res 19 win eoulactjvith the points (I, and 7). hen

the throvkover switch l3 is operated to re verse [he dlrecllou otlhe current through- -ouj the system,'tl1e polarized relay being connected by means of the wires 22 and 23,

in parallel with the line wires, becomes operalirtngrausing the free end of the iron bar ilto be attracted downwardly, lifting thereby the ends of the flexihlelem-fes 1'9 agaiust'the force of the. spring 26 out of contactwith the terminals 1,1- aud b, and into current in the system is reversed.

contact with the terminals e and b. \Vith the current flowing as indicated by the arrows d it passes now through the field of the motor in the opposite direction. Leaving the field it goes to the terminal 6, which being in contact with the lower flexible leaf 19, will direct the current through the wire 28 to the armature 30, from which it will leave through the wire-29 to the upper flexible leaf 19, which now being in contact with the terminal a will direct it back through the wire 11, throw-over switch 13 and wire 15 to the generator 1() Thus the current is reversed by means of the polarized relay in the field of the motor while the direction of its flow remains unchanged in the armature.

It is obvious that the armature and the field be interchanged by merely at- A modification of the system is shown in Fig. 2, whereina shunt-wound motor replaces the series motor in the system disclosed in Fig. 1. In this case the field 17 is permanently placed in parallel with the line wires 11 and 12 by means of the wires 18 and 18. The. armature 30 is as before connected to the flexible leaves 19; the points a and a are connected together. and to the line wire 11 by means of the wire 31, and the points 6 and b are connected to the line wire 12 by means of the wire 32.

- The operation of the system as applied to shunt-wound motors is substantially the same as when it is applied to series wound motors, the series of arrows 0 and (i being employed to show the direction of the flow of current when the switch 13 is in its direct and reversing positions res actively. The

a current leaves' the gener: or 10, passes through the throw-over switch 13, through the line-wire 11 to the terminal a, through the flexible lower leaf 19, thence through the armature 30, and back through the up er leaf l91to the terminal I), and back to t e gen-' cratin source throughthe wires 32, 13 and 14. l hen the switch 13 is thrown over to reverse the current j,, pugh the field and the polarized relay, awe-111 flow as indicated by the arrows d, and will pass up the line wire 12 along the wire 32 to the terminal 6, and as the current flowing in this direction renders the polarized relay operative, the flexible leaves 19 move out of contact automatically through the agency of the polarized relay, with the terminals aZ into contactavith the terminals (i -b. The current having arrived at the point I) then asses along the lower leaf 19 through the wire 28 as before into the armature 30, and back the-flexible leaves 19 in contact with the points a and b. When, however, the current enters by means of the line wire 12 the polarized relay becomes operative, and exerts a pull upon the end of the bar 24, moving it about its ivot to reverse the current in either the eld or the armature as the position of the field or the armature may require.

It is obvious that minor changes and arrangement of par'ts may be resorted to with out departing from the spirit or sco e of my invention, or sacrificing any of the enefits thereof.

I claim: 1. system of motor control comprising a motor, main wires delivering electricity to the motor, a throw-over switch located between the main wires, a ermanent magnet having an oscillatory po e, a pair of electro-magnets op ositely wound connected in parallel with t 0 said main wires and in series with each other, said electramagnets being adapted to cooperate with the oscillatory pole of the permanent magnet to oscillate the same, a switch actuated by said oscillatory pole, connections between the said switch and the field and armature of the motor whereby current flowing'through the main wires in one direction will flow through the field and. armature in opposite directlons and through the field and armature in the samedirection when the current inthe main wires is reversed.

2. A system of motor control comprising a motor, main wires delivering electricit to the motor and connected to thefield o the motor, a throw-over switch located between said main wires, 21 permanent magnet having an oscillatory pole, a pair of electromagnets oppositely wound connected in parallel with the said main wires and in series with each other, said electro-magnetspermanent. ma leaves 0 the switch w ereby current flowing through'the system in one direction will move the oscillatory pole to bring the leaves of the switch into engagementwith one flows in one direction and through the field 7 an of contact. pomts and the reversal of and armature 1n opposlte dlleCtlOllS when o the current \Vlll move the'oscllldtory pole the current is; reversed.

of the permanent lna 'net to brin the leaves *1 0f the switch into engagement with the HOVVAR'D bANDIDGE other pair of Contact pmnts, thereby (lirect- Witnesses:

ing the current through the field and arma- J. G. CARPENTER,

ture in the sal ne direction'when the current T. D. BUTLER. 

